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CryptoHack

A free, fun platform for learning modern cryptography

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Learn By Doing

Learn about modern cryptography by solving a series of interactive puzzles and challenges. Get to know the ciphers and protocols that secure the digital world by breaking them.

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Level Up

Earn points by solving challenges. Finish categories to earn trophies and gain levels to track your progress. Can you reach the top of the scoreboard?

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Fresh Challenges

We are constantly creating new challenges to keep your crypto knowledge up to date. Expect exciting brainteasers and whole new categories as the site continues to grow.

New Challenges
ECLCG (HITCON CTF) CTF Archive 0
Sus (ImaginaryCTF) CTF Archive 0
Share (HITCON CTF) CTF Archive 0
Leet Universe (ImaginaryCTF (Daily)) CTF Archive 0
Hyper512 (HITCON CTF) CTF Archive 0
Weekly Top Users
#1 aicodesdev 5170
#2 yardenporat 3520
#3 B0017724ijas 3345
#4 b00177264 3335
#5 Revathy 3228
Recent Solves
Base64 saranovkov1c
Adrien's Signs siren0
Finding Flags moaazibrahim
Greatest Common Divisor dev1lsfav0rite
Hex saranovkov1c
Recent Solutions
Hamiltonicity 1 r4sti 0
No Difference ispo 0
Jack's Birthday Hash danieleven 0
Oh SNAP randomcatcoding 0
Missing Modulus ECM 0

Level Up

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